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. 2014 Jul 5;4:1–4. doi: 10.1016/j.btre.2014.06.010

Fig. 2.

Fig. 2

Principle component analysis of dd-PCR (a) and qPCR (b) datasets. ●, digester A; ■, digester B; and ▲, digester C. Percentage variance of methanogen composition explained by each axis is shown in parentheses. Arrows indicate the direction of increase for the methanogen groups.